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