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