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