One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(9,10)(11,15)(12,14)(13,16)(17,18,21,24)(19,26,27,23)(20,28,29,32)(22,31,30,25)(1,2,4,5)(3,6,7,8)(9,11,12,16)(10,13,14,15)(17,19,21,27)(18,23,24,26)(20,25,29,31)(22,28,30,32)(3,7)(6,8)(11,16)(13,15)(17,20,22,23,21,29,30,26)(18,19,25,28,24,27,31,32)(1,3,4,7)(2,6,5,8)(10,14)(13,15)(18,24)(19,27)(25,31)(28,32)(2,5)(6,8)(19,27)(20,29)(23,26)(28,32) involution — undirectedA 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.