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