The PDF translation of a SOLIDWORKS drawing generated during initial Item creation and subsequent check-ins retains its colour. However, when an item is released, its PDF translation retains no colours. I would like to suggest that at a future update, that color are presented in the PDFS, mainy times during a release process we use the actual model display to send to customers or outside consultants.
https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/PDF-translation-fi...