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