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