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