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