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)(11,12,14,18)(13,20,21,16)(15,17,23,19)(22,25,26,24)(3,5)(4,8)(6,9)(7,10)(11,13,14,21)(12,16,18,20)(15,22,23,26)(17,24,19,25)(3,6,7,4)(5,9,10,8)(12,17)(15,23)(16,24)(18,19)(20,25)(22,26)(5,10)(8,9)(13,21)(16,20)(22,26)(24,25) involution — undirected(12,18)(16,20)(17,19)(24,25) 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.