One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10,12,14)(11,15,16,13)(18,19)(22,23)(26,27)(31,32)(2,4)(3,8)(11,16)(13,15)(17,18)(19,21)(20,23)(22,24)(25,26,30,27)(28,32,29,31)(3,8)(6,7)(18,19)(22,23)(25,27,30,26)(28,32,29,31)(1,3,5,8)(2,6,4,7)(9,11)(10,13)(12,16)(14,15)(17,19,21,18)(20,23,24,22)(25,28,30,29)(26,31,27,32)(1,4,5,2)(3,7,8,6)(9,10)(11,13)(12,14)(15,16)(17,20,21,24)(18,22,19,23)(25,29,30,28)(26,32,27,31)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.