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