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