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