You can move it now - while the soil is still warm, to give it a chance of getting established before the cold weather arrives. However, don't cut it back until spring when you see new shoots, as these Salvias can die back in the winter, and leaving all the top growth on gives it more chance of survival.

Although you can cut off a few of the stem tips to use as cuttings. They root really easily in a pot indoors. Take 3 or 4 inch pieces and remove the bottom leaves. Trim to just below a leaf joint.