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