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