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