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