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