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