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