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