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