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