The printer component of the MP560 can take longer to appear than the scanner component. The scanner uses Bonjour to advertise itself on the wireless network, while the printer component uses a proprietary protocol called "canonijnetwork". If you select to add a printer and have the Default Add Printer view open, you will see the MP560 as Bonjour Scanner in the Kind column. But if you wait at least 15 seconds more, the printer should appear showing "canonijnetwork" in the Kind column.
If this printer component does not appear after 30 seconds maximum then it would suggest a problem with the printer driver installation. So open Finder and navigate to HD > Library > Printers > Canon > BJPrinter and trash the contents of this folder. Then download the latest MP560 driver via this link and run the installer. With the installation completed, try to add the printer again.