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