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