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