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