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