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