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