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