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)(17,18,23,22)(19,20,24,21)(25,26,29,32)(27,30,31,28)(1,3,5,8)(2,4,6,7)(9,11,14,13)(10,15,16,12)(17,19)(18,21)(20,22)(23,24)(25,27)(26,28)(29,31)(30,32)(2,6)(4,7)(10,16)(11,13)(17,20,23,21)(18,24,22,19)(25,27)(26,30)(28,32)(29,31)(1,3)(2,7)(4,6)(5,8)(9,12,14,15)(10,11,16,13)(17,21,23,20)(18,24,22,19)(1,4,5,7)(2,3,6,8)(9,13,14,11)(10,15,16,12)(17,22,23,18)(19,20,24,21)(25,28,29,30)(26,31,32,27)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.