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