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