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