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