One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(3,4)(5,9)(6,10)(7,8)(11,17)(12,15)(13,18)(14,16)(19,20,22,27,24,28,23,26)(21,25,30,33,31,32,29,34)(4,8)(9,15)(10,16)(17,18)(19,21)(20,25)(22,30)(23,29)(24,31)(26,34)(27,33)(28,32) involution — undirected(3,5,7,12)(4,9,8,15)(6,13,14,11)(10,18,16,17)(20,26)(21,29)(22,23)(25,32)(27,28)(30,31)(3,6,7,14)(4,10,8,16)(5,11,12,13)(9,17,15,18)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.