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