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