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