Keep it watered and put some mulch around it to shade the soil. And don't cut back branches because they have leaves on them that have browned - you'll be adding stem tissue loss to the leaf loss, instead of producing an improvement for the plant.

Also if that is a hot wall (as in south- or west-facing) maybe move the shrub to a less intense aspect. Because you have just transplanted it - perhaps from a more shaded previous position - and this is the hottest time of the year.