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