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