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