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