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