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