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