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