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