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