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