Grid in Appian

You can do it in two ways. 

1. Simple way - Just add all of it in the same grid and use the background color of the cells to create visual groups. You can then define the label of these colors in the legends below the grid. 
2. Add 4 grids adjacent to each other, with every row having the same height, and then you will be able to achieve this. (This adds a lot of configurations that you will manually have to adjust and control to ensure that the symmetry never breaks.