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