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