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