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