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