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