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