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