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