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