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