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