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