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