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