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