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)(2,5)(6,8)(9,11)(10,13)(12,16)(14,15)(17,18,23,19)(20,28,31,32)(21,25,22,27)(24,29,26,30)(1,3,4,7)(2,6,5,8)(10,14)(11,16)(17,19,23,18)(20,26,31,24)(21,25,22,27)(28,30,32,29)(10,14)(13,15)(17,20,22,30,23,31,21,29)(18,24,25,28,19,26,27,32)(2,5)(6,8)(10,14)(13,15)(17,21,23,22)(18,25,19,27)(20,29,31,30)(24,28,26,32)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.