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