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