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)(11,13,15,16)(17,18,21,23)(19,24,22,26)(20,25,28,30)(27,31,29,32)(2,6)(7,8)(9,11)(10,13)(12,15)(14,16)(18,23)(19,22)(20,27)(25,32)(28,29)(30,31) involution — undirected(1,3,5,4)(2,7,6,8)(10,14)(11,15)(17,19,21,22)(18,24,23,26)(20,27,28,29)(25,31,30,32)(1,3,5,4)(2,7,6,8)(10,14)(13,16)(17,20)(18,25)(19,27)(21,28)(22,29)(23,30)(24,31)(26,32)(1,4,5,3)(2,7,6,8)(17,19,21,22)(18,26,23,24)(20,27,28,29)(25,32,30,31)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.