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