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