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