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