well....first off
Regardless of visio or drawings, you cant have a port in two networks.....there is always a router or bridge or gateway between 2 network domains
(if you mean VLANs, then people will show them by different colored lines to a given port......one trick is use a fat line for physicals...say black....and 3 thin lines on top for VLAN X, Y,Z...say red, blue, green)
(if you are trying to highlight FCOE vs EN....same sort of approach as VLANs is used....if you really want to delineate that....cisco, brocade, Qlogic just calls the links converged and uses 1 line)
If you want to delineate the "storage domain" from the 'blade domain", then the drawing is fine.....but its a physical/logical/organizational paradigm....not a network paradigm
Second...you really dont want to use squiggly lines for cables....graphically, it makes the drawing cluttered and messy.....aka capallini with some pesto sauce ;-)
stick with right angled lines....or if isometric, use some of those connectors.
You might want to go to
www.ratemydiagram.com.....many examples of how people present this kind of info.