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