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