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