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