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