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