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