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