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