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