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