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