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