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