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