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