Walking a away from a signed contract at the car dealership?

Ok so I went in a decided to go with a Honda Civic and then, after all the numbers were done the only car they had was a color I didn't want. So they called another dealership to transfer one. I had to go to work but before I left they said to sign the contract and it had the black car on the top not the car I wanted. The reason they made me sign the paper is to have me agree on the numbers settled. He then said I would have to sign a different contract again tomorrow. I'm going to pick up the car today but I didn't sign for that car. Does this mean I could still back out if I wanted to?

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