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