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