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