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