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