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