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