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