FME’s colors do not apply to features with Surface or Solid geometry. For these, you must set appearances on the feature with an AppearanceSetter.

The Civil 3D reader seems to add the appropriate appearances to the Structure 3D features, but not the Pipe or Pressure Pipe 3D features. You can add these appearances using the following process:

thanks @daveatsafe  for your response.

I set the AttributeExposer, AppearanceStyler but once I wanna use AppearanceSetter and set the color to fme_color, it looks like the only option I have for that is User Parameter 

@daveatsafe here is the screenshot 

I was trying to assign a simple color and run just to make sure if it works or not, that I received the following error

Unmatched reference encountered in 'C:/Users/Temp/

wb-cache-DWG to GDB-zLKVew/Main_AppearanceSetter -1 61 fo 0 OUTPUT  0  0ed5a1cb74c6d24072d51b65722dd680f03446ba.ffs'.  It could be that a FFS file is missing the associated FRS file.
An error has occurred. Check the logfile above for details
Failed to read features
 

You don’t have to set the color in the AppearanceSetter. The appearance created by the AppearanceStyler will supply that for you. Please leave the color settings in the AppearanceSetter untouched.

Thanks @daveatsafe for quick response

I am receiving these error 

Unmatched reference encountered in 'C:/Users/***~1/AppData/Local/Temp/wb-cache-DWG to GDB-sADUOh/Main_AppearanceSetter -1 115 fo 0 OUTPUT  0  e1786f0d3f6eb1a9e96ba8d65789bb1158aed30c.ffs'.  It could be that a FFS file is missing the associated FRS file.
An error has occurred. Check the logfile above for details
Failed to read features

Please try turning off Feature Caching, from the Workbench top menu Run option, then try running the workspace again.