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