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