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