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