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