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