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