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