Keep in mind all Jamie said. I've been growing salvia indoors, and once I took a rooted cutting that was not looking nice, I put it in a terrace outdoors with indirect light and it resurrected in a matter of days. All the new shoots look awesome. The only drawback is having to control pests, but a little attention usually suffices.
Regarding the yellowing of the leaves,
Erowid wrote:Yellow-leafed Salvia divinorum usually is a signal that the plant is receiving too much water. Over watering leaches out nutrients that the plant uses to create chlorophyll - a green energy-absorbing pigment. We've seen this in west coast S. divinorum left outdoors during the rainy winter season. To green up the leaves, reduce water and feed the plant some chelated iron (powder or liquid form) according to the directions on the bottle. Feeding with Stern's Miracid® which contains chelated iron and other nutrients, will usually do the trick.
Yours looks over-watered. If the climate you are in is not extremely dry (and it doesn't look like it at all, according to what you say) avoid humidity tents, give it an indirect light outdoors spot with good air flow and only mist the plant occasionally, I'd say once a day at the most, and in the evening. Water only when the soil starts to feel dry, and make sure it is well aired. If the mix you have is very compact, you can stir gently the surface or make a few holes with a toothpick. When you repot it, use perlite in the soil mix. The cutting should recover fine, salvia is a surprisingly strong plant.
"The Menu is Not The Meal." - Alan Watts