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