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