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