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