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