There are various ways to ...

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There are various ways to reduce color.  There is none as best method. The best method is one which suites your effluent. You have to try these out yourself at your specific site. 

Firstly you may just add Ferric Alum. This reduces color due some color dyes used in textiles

You may use Color removal resins. You may use color removal resin from Thermax or from Purolite or Ion Exchange. The color removal resins are to be used in a column like regular ion exchange unit. However, you should have preceeding unit using Polyelectrolyte Lime alum also.