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