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