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