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)(11,14,15,16)(17,18,20,23)(19,25,27,22)(21,24,28,31)(26,32,29,30)(10,13)(11,15)(19,26)(21,28)(22,30)(24,31)(25,32)(27,29) involution — undirected(2,5)(6,8)(9,11,12,15)(10,14,13,16)(17,19,20,27)(18,22,23,25)(21,29,28,26)(24,32,31,30)(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,19,20,27)(18,22,23,25)(21,29,28,26)(24,32,31,30)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.