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