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