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