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