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