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