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