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