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