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