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