When opening Solid Edge in assembly mode and viewing a part in the Parts Library, the part displays in its actual colors. However, in the preview pane of the file, the part appears in a different color, e.g. blue.
This is working as designed.
The user has the Preview... mode for the Parts Library preview pane set to "Interactive" for parts.
With the Preview mode set to Interactive the model will display in the pane with the default part color as defined in the Solid Edge Options -> Colors -> Active part.
If the user would prefer to see the preview that more closely matches the part then the customer can change the preview mode to "Bitmap".