Microsoft has provided add-in for Visio 2010 which integrates with SCVMM and SCOM.

With these add-in you will have a global vision of your infrastructure and will be able to provide better service.

Go to http://www.microsoft.com/showcase/en/us/details/18ea5032-532c-4d85-a2cd-fdf4adf3acec to get more details

Go to http://visiotoolbox.com/downloads/addins/Visio_2010_Add-in_for_System_Center_Operations_Manager_2007_R2_961.aspx to get the add-in