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