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