I have the Ladylux plus. I was confused on how to remove this as well. There is a quick release plastic piece, just pull down on the yellow part on the connector under the sink. Disconnect the plastic connector from the hose and pull it right out of the faucet. Very easy to remove in this case.

Please see the technical resource at http://www.groheamerica.com/lib/1/tpi/1311421.pdf. This.pdf has an exploded parts diagram that will assist in taking the fixture apart. It looks like the entire fixture has to be disassembled to remove the spray hose. Please let me know if I can be of any further help. Good luck.