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