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