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