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