According to my map of all the climbing areas in France, it is the closest area. Around 200 climbs scattered amongst 3 crags. Further North is Ceou with around 180 routes. Gorge du Tarn has already been mentioned but may be above your grade.
To the E and SE of Toulouse is Le Clape and Vingrua. To the North of Montpellier is Thurac.
I have climbed at Le Clape and Thurac and both are great for climbing up to grade 19. I would recommend you take a 60m rope.
If you want some further info, feel free to contact.