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