Answer
See the picture below
Work Step by Step
In order to graph the function, we have to calculate some points on the curve:
If x=0 $\log_{\frac{1}{5}}0$ diverges to $\infty$
If x=1 $f(x)=\log_{\frac{1}{5}}1=0$
If x=2 $f(x)=\log_{\frac{1}{5}}2=-0.4307$
If x=5 $f(x)=\log_{\frac{1}{5}}5=-1$
If x=25 $f(x)=\log_{\frac{1}{5}}25=-2$
By connecting these points, we can plot the curve.