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