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