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