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