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