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