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