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