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