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