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