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