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