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