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)(11,14)(12,15)(13,16)(17,18,21,23)(19,22,27,31)(20,24,28,32)(25,29,26,30)(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,16,15)(17,19,21,27)(18,22,23,31)(20,25,28,26)(24,29,32,30)(9,11,13,12)(10,15,16,14)(19,25)(20,28)(22,29)(24,32)(26,27)(30,31)(2,6)(5,7) involution — undirected(3,8)(5,7)(9,12,13,11)(10,15,16,14)(18,23)(19,25)(20,28)(22,30)(26,27)(29,31)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.