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