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