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