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