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