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