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