All switches in this area are shown with red and green wires leading to the "common" terminals on the switch.  When the switch's position causes other terminals on the switch to make a contact with the "common" terminal, these other terminals are identified by changing their color to the match the color of the wire they are making contact with (either red or green). This common 2 way switch has 2 sets of connections.  Each switch position makes contact from the "common" terminals to other terminals.