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