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