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