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