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