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)(17,18,22,26)(19,23,21,24)(20,28,30,31)(25,29,32,27)(1,3,5,7)(2,6,8,4)(9,11)(10,14)(12,16)(13,15)(17,19,22,21)(18,23,26,24)(20,29,30,27)(25,28,32,31)(1,4,5,6)(2,7,8,3)(10,13)(11,15)(14,16)(18,24)(19,21)(23,26)(25,28)(27,29)(31,32)(2,8)(3,7)(11,16)(14,15)(17,20,22,30)(18,25,26,32)(19,27,21,29)(23,31,24,28)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.