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