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