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