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