Please learn to use the "find example ..." from the "Help" menu, search for "colors", there is a VI called "Create IntGraph Color Table.vi" which you can use to generate the color table you want to use. Then you need to create a property node of the intensity graph and there is a property called "colorTable". Wire the value you get from the other vi to this property.
The VI basically "cuts / divide" the input of the intensity graph into 4 even quadrants (Q1 - Q4, see the coord in the vi). Each quadrants is a subset of the data you send to the graph, and each quadrants is a 2D array. As long as your data is 2D array then it does not matter what you wire in. The basic idea is to combine 4 small intencity graph into a big one, each small one occupies one quadrant. On the diagram everything inside the rectangle should be made into a subvi. To do so, select everything inside it, and goto "Edit" >> "Create SubVI", Joe