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