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