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