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