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