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