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