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