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