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