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