text: Title: Assign unique color to different values in unsorted bar charts
  Body: Currently, all bars in the bar chart has the same color, this makes comparison across items challenging. In particular, users need to read the bar labels to realize that the bars are sorted to match other charts for comparison. We should assign a consistent set of colors for low cardinality categorical attributes to facilitate ease of comparison. We can use a standard color pallette for the particular visualization library ([Vega](https://vega.github.io/vega/docs/schemes/#categorical), [matplotlib](https://matplotlib.org/3.1.1/tutorials/colors/colormaps.html)).
  
  ![image](https://user-images.githubusercontent.com/5554675/90727772-6276b380-e2f6-11ea-9798-2c7fb3d6ed41.png)
  The update bars would look something like this, where all values of Cylinder=4 is green, all values of Cylinders of 8 is yellow, etc.
  ![image](https://user-images.githubusercontent.com/5554675/90728317-49223700-e2f7-11ea-89d7-b7e7ef648ee4.png)
  