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