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