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