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