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