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)(11,15)(12,16)(13,14)(17,18,20,24,21,23,29,28)(19,25,27,32,26,22,30,31)(2,5)(6,7)(10,14)(11,12)(17,18)(19,25)(20,28)(21,23)(22,26)(24,29)(27,31)(30,32) involution — undirected(1,3,4,8)(2,6,5,7)(9,11,13,12)(10,15,14,16)(17,19)(18,22)(20,27)(21,26)(23,25)(24,31)(28,32)(29,30)(9,12,13,11)(10,16,14,15)(18,23)(22,25)(24,28)(31,32)(19,26)(22,25)(27,30)(31,32) 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.