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)(13,16)(14,17)(15,19)(18,22)(20,23)(21,25)(24,26) involution — undirected(3,4)(5,8)(6,7)(9,10)(11,13,15,21)(12,16,19,25)(14,20,22,26)(17,23,18,24)(12,17)(14,22)(16,23)(18,19)(20,26)(24,25) involution — undirected(4,7)(8,10) involution — undirected(3,5,6,9)(4,8,7,10)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.