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