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