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