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