One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(9,10)(11,13)(12,14)(15,16)(19,26)(23,27)(28,29)(31,32) involution — undirected(1,3,5,4)(2,6,7,8)(9,11,12,15)(10,13,14,16)(17,18)(19,27)(20,22)(21,25)(23,26)(24,30)(28,32)(29,31)(1,4,5,3)(2,6,7,8)(10,14)(13,16)(18,22)(19,28)(20,30)(24,25)(26,29)(31,32)(17,19,21,26)(18,23,25,27)(20,28,30,29)(22,31,24,32)(18,24)(19,28)(20,30)(22,25)(23,27)(26,29) 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.