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