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