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