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