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