sprinkle, wash, free and easy
灑 centers on scattering liquid lightly: sprinkling water, washing by splashing, and by extension a free and easy manner that flows without constraint.
灑 combines 氵 (water) with 麗, which likely contributes the sound and the idea of spreading or scattering, giving the sense of sprinkling water.
Water 氵 splashing over a beautiful deer 麗: imagine sprinkling water to wash a deer, making it look free and easy.
For シャ, picture a shower of water sprinkling down: shower -> シャ, and the water washes everything freely.