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