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