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