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