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