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