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