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