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