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