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