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