In case you missed this, Daniel Feller offered up a set of Visio stencils for a Citrix environment.  This one stencil has just about everything you will need to create detailed Citrix solution diagrams.  Included are items for the following products:

• XenApp
• XenDesktop
• XenServer
• NetScaler (includes rack-mountable stencils and NetScaler MPX)
• WANScaler (including the new Branch Repeater)
• Access Gateway
• Application Firewall
• Provisioning Server
• EdgeSight
• Password Manager
• Workflow Studio

If something is missing, drop Daniel a comment to see if he can help you out.

Download Visio Stencils here