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