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