changing the layer color

Is there a way of changing each layers color link in autocad? otherwise it makes it really hard to see whats what when viewing several layers

you mean Blender, right? If not, you’ve got the wrong forum. In Blender, no. I keep a cheat sheet in a text window that tells me what kinds of objects are on what layers in order to stay organized. see http://mediawiki.blender.org/index.php/Manual/Layers

sorry, i meant like in autocad.

Ie have a different wire color for diferent objects or groups.