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)(13,17)(14,18)(15,16)(20,21)(24,25) involution — undirected(4,7)(5,10)(12,16)(14,17)(19,20,23,21)(22,25,26,24)(3,4,6,7)(5,8,10,9)(11,13,15,18)(12,17,16,14)(19,21,23,20)(22,25,26,24)(3,4)(5,8)(6,7)(9,10)(11,14,15,17)(12,18,16,13)(19,22)(20,24)(21,25)(23,26)(3,5,6,10)(4,8,7,9)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.