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