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