This is a yes/no question which means you should raise your eyebrows for the whole question. People might be tempted to sign CAN for this question but it is not necessary as the CAN YOU aspect is shown in the eyebrows basically. This is more of a request as opposed to asking whether someone is able to do something.
The sign CAN is more used in the sense of asking if someone is able to do something/has the ability to & expressing that someone is able to do something/has the ability to. Example: "Can you run 5 miles?"