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