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