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