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