Just got my hair colored...

It's good that you care to protect your new colour! The best way is to first, wet/dampen your hair and then smother some leave-in conditioner or oil (coconut or olive oil) on it. If you are in and out of a pool/water, bring the conditioner/oil with you and re-apply it before you go back in. Then when you are done swimming, wash your hair with a clarifying shampoo to rid it of the chlorine/salt and conditioner you had on it. Have fun!