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