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