There are three things at play here...
Draenor (aka outlands before it was ripped apart)
The Great Dark(space for the universe of warcraft)
The Twisting Nether (alternate space - present everywhere the great dark is but in a different dimension different laws/rules of physics)
Point of Interest...
You can see Azeroth from Outlands but you can't see Outlands from Azeroth. No true explanation why. Theory - since the twisting nether is everywhere the idea there is a "version" of Azeroth visible there because of that. However since Draenor was ripped apart and destroyed there are no laws in the great Dark that allow it to still have some shape let alone life