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