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