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