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