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