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