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