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