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