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