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