Jose,
We do not have any templates for that in SmartDraw I'm afraid. You can certainly draw something like that using the shape and line tools though. You can even draw it to scale if you wish. You can use the Hatch Fill feature to differentiate between the different layers as well. That would be done manually though. You can also use the Text tool on the Home Ribbon to add a key.
See the attached example I drew for a customer from a while back (hopefully it is roughly what you are seeking).
For an explanation on drawing to scale in SmartDraw, use this link to our floor plans tutorial:
http://www.smartdraw.com/tutorials/floorplans/tutorial_05.htm
Regards,
SmartDraw Support