Is there a library of graphical objects in Vijeo Designer?

Yes. In Vijeo Designer's toolchest, there are two folders with many different graphical objects. The names of these folders are:

Image Library
Schneider Electric Image Library

Please have a look in these folders to see if there is something that fits your requirement.

If you do not find what you need, you can also import a PNG, BMP, JPG, or EMF file in Vijeo Designer using the image object.