SOTA Sapphire II motor wires detached

The wire that goes from the 5v power supply and split into a red and grey wire detached from the terminals on the motor under the push on/off button on the table. There's two wires, one grey and one reddish grey. Can anyone tell me which wires goes to which terminal?
 
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Here are photos of what I am trying to do. The top left photo of wires needs to be connected to the top right photo terminals. The bottom left photo is the power switch that the terminals sit under. The bottom right photo is the other end of the wire to power supply. How can I tell which are positive and negative? Thanks.

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