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