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