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