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