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