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