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