The main parking places in Grächen are shown here.
Prices range from CHF 5 to 7 per day for outside parking and CHF 10 to 15 for indoor parking.
Open this map on your phone with the link below.
https://drive.google.com/open?id=1IpoJprspDMa7twsVrug4fIrQkKIi7SzM&usp=sharing