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