diff --git a/client/src/components/categorical/category/index.js b/client/src/components/categorical/category/index.js
index d8366104..af8daba0 100644
--- a/client/src/components/categorical/category/index.js
+++ b/client/src/components/categorical/category/index.js
@@ -44,6 +44,8 @@ const LABEL_WIDTH_ANNO = LABEL_WIDTH - ANNO_BUTTON_WIDTH;
     schema,
     crossfilter: state.obsCrossfilter,
     isUserAnno,
+    genesets: state.genesets.genesets,
+    differential: state.differential,
   };
 })
 class Category extends React.PureComponent {
@@ -142,9 +144,16 @@ class Category extends React.PureComponent {
     */
     const { schema } = annoMatrix;
     const { colorAccessor, colorMode } = colors;
+    const { genesets, differential } = this.props;
     let colorDataPromise = Promise.resolve(null);
     if (colorAccessor) {
-      const query = createColorQuery(colorMode, colorAccessor, schema);
+      const query = createColorQuery(
+        colorMode,
+        colorAccessor,
+        schema,
+        genesets,
+        differential.diffExp
+      );
       if (query) colorDataPromise = annoMatrix.fetch(...query);
     }
     const [categoryData, colorData] = await Promise.all([
diff --git a/client/src/components/continuousLegend/index.js b/client/src/components/continuousLegend/index.js
index 5087ab59..da2746f2 100644
--- a/client/src/components/continuousLegend/index.js
+++ b/client/src/components/continuousLegend/index.js
@@ -106,16 +106,26 @@ const continuous = (selectorId, colorScale, colorAccessor) => {
 @connect((state) => ({
   annoMatrix: state.annoMatrix,
   colors: state.colors,
+  genesets: state.genesets.genesets,
+  differential: state.differential,
 }))
 class ContinuousLegend extends React.Component {
   async componentDidUpdate(prevProps) {
-    const { annoMatrix, colors } = this.props;
+    const { annoMatrix, colors, genesets, differential } = this.props;
     if (!colors || !annoMatrix) return;
 
     if (colors !== prevProps?.colors || annoMatrix !== prevProps?.annoMatrix) {
       const { schema } = annoMatrix;
       const { colorMode, colorAccessor, userColors } = colors;
-      const colorQuery = createColorQuery(colorMode, colorAccessor, schema);
+
+      const colorQuery = createColorQuery(
+        colorMode,
+        colorAccessor,
+        schema,
+        genesets,
+        differential.diffExp
+      );
+
       const colorDf = colorQuery ? await annoMatrix.fetch(...colorQuery) : null;
       const colorTable = createColorTable(
         colorMode,
diff --git a/client/src/components/geneExpression/geneSet.js b/client/src/components/geneExpression/geneSet.js
index 39ab5ef8..23614a87 100644
--- a/client/src/components/geneExpression/geneSet.js
+++ b/client/src/components/geneExpression/geneSet.js
@@ -184,7 +184,12 @@ class GeneSet extends React.Component {
             )}
           </span>
           <div>
-            <GenesetMenus genesetsEditable geneset={setName} />
+            <GenesetMenus
+              isOpen={isOpen}
+              toggleSummaryHisto={toggleSummaryHisto}
+              genesetsEditable
+              geneset={setName}
+            />
           </div>
         </div>
 
diff --git a/client/src/components/geneExpression/menus/genesetMenus.js b/client/src/components/geneExpression/menus/genesetMenus.js
index 129098d6..9082ed68 100644
--- a/client/src/components/geneExpression/menus/genesetMenus.js
+++ b/client/src/components/geneExpression/menus/genesetMenus.js
@@ -1,12 +1,14 @@
 import React from "react";
 import { connect } from "react-redux";
+import { Tooltip2 } from "@blueprintjs/popover2";
+
 import {
   Button,
+  AnchorButton,
   Menu,
   MenuItem,
   Popover,
   Position,
-  Tooltip,
   Icon,
   PopoverInteractionKind,
 } from "@blueprintjs/core";
@@ -18,6 +20,7 @@ import AddGeneToGenesetDialogue from "./addGeneToGenesetDialogue";
 @connect((state) => {
   return {
     genesetsUI: state.genesetsUI,
+    colorAccessor: state.colors.colorAccessor,
   };
 })
 class GenesetMenus extends React.PureComponent {
@@ -43,19 +46,41 @@ class GenesetMenus extends React.PureComponent {
     });
   };
 
+  handleColorByEntireGeneset = () => {
+    const { dispatch, geneset } = this.props;
+
+    dispatch({
+      type: "color by geneset mean expression",
+      geneset,
+    });
+  };
+
   handleDeleteCategory = () => {
     const { dispatch, geneset } = this.props;
     dispatch(actions.genesetDelete(geneset));
   };
 
   render() {
-    const { geneset, genesetsEditable, createText } = this.props;
+    const {
+      geneset,
+      genesetsEditable,
+      createText,
+      colorAccessor,
+      isOpen,
+      toggleSummaryHisto,
+    } = this.props;
+
+    const isColorBy = geneset === colorAccessor;
+    const genesetClosed = !isOpen;
+    const showingAllGenes = !toggleSummaryHisto;
+
+    const notShowingSummary = genesetClosed || showingAllGenes;
 
     return (
       <>
-        {genesetsEditable ? (
+        {genesetsEditable && (
           <>
-            <Tooltip
+            <Tooltip2
               content={createText}
               position={Position.BOTTOM}
               hoverOpenDelay={globals.tooltipHoverOpenDelay}
@@ -69,7 +94,7 @@ class GenesetMenus extends React.PureComponent {
                 small
                 minimal
               />
-            </Tooltip>
+            </Tooltip2>
             <AddGeneToGenesetDialogue geneset={geneset} />
             <Popover
               interactionKind={PopoverInteractionKind.HOVER}
@@ -104,15 +129,24 @@ class GenesetMenus extends React.PureComponent {
                 minimal
               />
             </Popover>
-            <Button
-              disabled
-              style={{ marginLeft: 0 }}
-              data-testclass="colorby-entire-geneset"
-              data-testid={`${geneset}:colorby-entire-geneset`}
-              icon={<Icon icon="tint" iconSize={16} />}
-            />
+            <Tooltip2
+              content={`Color by gene set ${geneset} mean (gene set must be open, and toggled to mean expression histogram)`}
+              position={Position.BOTTOM}
+              hoverOpenDelay={globals.tooltipHoverOpenDelay}
+            >
+              <AnchorButton
+                disabled={notShowingSummary && !isColorBy}
+                active={isColorBy}
+                intent={isColorBy ? "primary" : "none"}
+                style={{ marginLeft: 0 }}
+                onClick={this.handleColorByEntireGeneset}
+                data-testclass="colorby-entire-geneset"
+                data-testid={`${geneset}:colorby-entire-geneset`}
+                icon={<Icon icon="tint" iconSize={16} />}
+              />
+            </Tooltip2>
           </>
-        ) : null}
+        )}
       </>
     );
   }
diff --git a/client/src/components/graph/graph.js b/client/src/components/graph/graph.js
index 86ccc2b3..94ed820e 100644
--- a/client/src/components/graph/graph.js
+++ b/client/src/components/graph/graph.js
@@ -76,6 +76,8 @@ function createModelTF() {
   graphInteractionMode: state.controls.graphInteractionMode,
   colors: state.colors,
   pointDilation: state.pointDilation,
+  genesets: state.genesets.genesets,
+  differential: state.differential,
 }))
 class Graph extends React.Component {
   static createReglState(canvas) {
@@ -526,6 +528,7 @@ class Graph extends React.Component {
       colorsProp,
       pointDilation
     );
+
     const { currentDimNames } = layoutChoice;
     const X = layoutDf.col(currentDimNames[0]).asArray();
     const Y = layoutDf.col(currentDimNames[1]).asArray();
@@ -782,10 +785,17 @@ class Graph extends React.Component {
   }
 
   createColorByQuery(colors) {
-    const { annoMatrix } = this.props;
+    const { annoMatrix, genesets, differential } = this.props;
     const { schema } = annoMatrix;
     const { colorMode, colorAccessor } = colors;
-    return createColorQuery(colorMode, colorAccessor, schema);
+
+    return createColorQuery(
+      colorMode,
+      colorAccessor,
+      schema,
+      genesets,
+      differential.diffExp
+    );
   }
 
   renderPoints(
diff --git a/client/src/components/graph/overlays/centroidLabels.js b/client/src/components/graph/overlays/centroidLabels.js
index 65f22215..21427b25 100644
--- a/client/src/components/graph/overlays/centroidLabels.js
+++ b/client/src/components/graph/overlays/centroidLabels.js
@@ -14,6 +14,8 @@ export default
   dilatedValue: state.pointDilation.categoryField,
   categoricalSelection: state.categoricalSelection,
   showLabels: state.centroidLabels?.showLabels,
+  genesets: state.genesets.genesets,
+  differential: state.differential,
 }))
 class CentroidLabels extends PureComponent {
   static watchAsync(props, prevProps) {
@@ -74,10 +76,16 @@ class CentroidLabels extends PureComponent {
   };
 
   colorByQuery() {
-    const { annoMatrix, colors } = this.props;
+    const { annoMatrix, colors, genesets, differential } = this.props;
     const { schema } = annoMatrix;
     const { colorMode, colorAccessor } = colors;
-    return createColorQuery(colorMode, colorAccessor, schema);
+    return createColorQuery(
+      colorMode,
+      colorAccessor,
+      schema,
+      genesets,
+      differential.diffExp
+    );
   }
 
   async fetchData() {
diff --git a/client/src/components/scatterplot/scatterplot.js b/client/src/components/scatterplot/scatterplot.js
index b70fd4ae..6aa94b24 100644
--- a/client/src/components/scatterplot/scatterplot.js
+++ b/client/src/components/scatterplot/scatterplot.js
@@ -53,6 +53,7 @@ const getYScale = memoize(getScale);
 
     differential: state.differential,
     crossfilter,
+    genesets: state.genesets.genesets,
   };
 })
 class Scatterplot extends React.PureComponent {
@@ -313,10 +314,16 @@ class Scatterplot extends React.PureComponent {
   }
 
   createColorByQuery(colors) {
-    const { annoMatrix } = this.props;
+    const { annoMatrix, genesets, differential } = this.props;
     const { schema } = annoMatrix;
     const { colorMode, colorAccessor } = colors;
-    return createColorQuery(colorMode, colorAccessor, schema);
+    return createColorQuery(
+      colorMode,
+      colorAccessor,
+      schema,
+      genesets,
+      differential
+    );
   }
 
   updateColorTable(colors, colorDf) {
diff --git a/client/src/reducers/colors.js b/client/src/reducers/colors.js
index a95b51ce..39d021a1 100644
--- a/client/src/reducers/colors.js
+++ b/client/src/reducers/colors.js
@@ -4,8 +4,8 @@ Color By UI state
 
 const ColorsReducer = (
   state = {
-    colorMode: null,
-    colorAccessor: null,
+    colorMode: null /* by continuous, by expression */,
+    colorAccessor: null /* tissue, Apod */,
   },
   action,
   nextSharedState,
@@ -96,6 +96,21 @@ const ColorsReducer = (
       };
     }
 
+    case "color by geneset mean expression": {
+      /* toggle between this mode and reset */
+      const resetCurrent =
+        action.type === state.colorMode &&
+        action.geneset === state.colorAccessor;
+      const colorMode = !resetCurrent ? action.type : null;
+      const colorAccessor = !resetCurrent ? action.geneset : null;
+
+      return {
+        ...state,
+        colorMode,
+        colorAccessor,
+      };
+    }
+
     default: {
       return state;
     }
diff --git a/client/src/reducers/undoableConfig.js b/client/src/reducers/undoableConfig.js
index e1907c3a..d18270ad 100644
--- a/client/src/reducers/undoableConfig.js
+++ b/client/src/reducers/undoableConfig.js
@@ -80,6 +80,7 @@ const saveOnActions = new Set([
   "color by categorical metadata",
   "color by continuous metadata",
   "color by expression",
+  "color by geneset mean expression",
 
   "show centroid labels for category",
 
diff --git a/client/src/util/stateManager/colorHelpers.js b/client/src/util/stateManager/colorHelpers.js
index 4692d48c..c931e77a 100644
--- a/client/src/util/stateManager/colorHelpers.js
+++ b/client/src/util/stateManager/colorHelpers.js
@@ -12,8 +12,15 @@ import { range } from "../range";
 given a color mode & accessor, generate an annoMatrix query that will
 fulfill it
 */
-export function createColorQuery(colorMode, colorByAccessor, schema) {
-  if (!colorMode || !colorByAccessor || !schema) return null;
+export function createColorQuery(
+  colorMode,
+  colorByAccessor,
+  schema,
+  genesets,
+  diffExp
+) {
+  if (!colorMode || !colorByAccessor || !schema || !genesets) return null;
+
   switch (colorMode) {
     case "color by categorical metadata":
     case "color by continuous metadata": {
@@ -33,6 +40,38 @@ export function createColorQuery(colorMode, colorByAccessor, schema) {
         },
       ];
     }
+    case "color by geneset mean expression": {
+      const varIndex = schema?.annotations?.var?.index;
+
+      if (!varIndex) return null;
+      if (!genesets) return null;
+
+      let _geneset;
+      let _setGenes;
+
+      if (colorByAccessor === "Temp DiffExp Set") {
+        _geneset = diffExp;
+        _setGenes = _geneset.map((diffexpResultItem) => {
+          const geneName = diffexpResultItem[0];
+          return geneName;
+        });
+      } else {
+        _geneset = genesets.get(colorByAccessor);
+        _setGenes = [..._geneset.genes.keys()];
+      }
+
+      return [
+        "X",
+        {
+          summarize: {
+            method: "mean",
+            field: "var",
+            column: varIndex,
+            values: _setGenes,
+          },
+        },
+      ];
+    }
     default: {
       return null;
     }
@@ -86,6 +125,11 @@ function _createColorTable(
       const { min, max } = col.summarize();
       return createColorsByContinuousMetadata(col.asArray(), min, max);
     }
+    case "color by geneset mean expression": {
+      const col = colorByData.icol(0);
+      const { min, max } = col.summarize();
+      return createColorsByContinuousMetadata(col.asArray(), min, max);
+    }
     default: {
       return defaultColors(schema.dataframe.nObs);
     }