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