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