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