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