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