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