One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10,14,11)(12,13,15,16)(17,18,21,25)(19,26,22,23)(20,28,29,31)(24,27,32,30)(2,5)(6,7)(9,11,14,10)(12,16,15,13)(17,19,21,22)(18,23,25,26)(20,27,29,30)(24,31,32,28)(9,12,13,11,14,15,16,10)(17,20,22,30,21,29,19,27)(18,24,26,28,25,32,23,31)(1,3,4,8)(2,6,5,7)(18,25)(23,26)(24,32)(28,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.