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)(11,15)(12,16)(13,14)(18,21)(22,23)(26,29)(27,31) involution — undirected(2,6)(4,7)(10,14)(12,15)(17,18,20,21)(19,23,24,22)(9,10)(11,15)(12,16)(13,14)(25,26,28,29)(27,30,31,32)(1,3)(2,7)(4,6)(5,8)(9,11,13,16)(10,15,14,12)(25,27)(26,30)(28,31)(29,32)(1,4,5,7)(2,3,6,8)(9,12,13,15)(10,16,14,11)(17,19,20,24)(18,22,21,23)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.