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