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