One vertex per element, one color per generator, with an edge from x to x·s.
(1,2) involution — undirected(4,7)(5,9)(8,10)(11,12,15,18)(13,19,20,26)(14,22,24,17)(16,23,25,21)(3,4)(5,10)(6,8)(7,9)(11,13)(12,16)(14,23)(15,20)(17,26)(18,25)(19,22)(21,24) involution — undirected(5,9)(7,10) involution — undirected(4,8)(7,10)(13,20)(16,25)(19,26)(21,23) 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.