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