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