I supposed your'e looking for a real world ESX 3.5 diagram and this can varies depends on the requirements, but if you understand the ESX 3.5 and design/architecture concepts than using Visio stencils provided and you can sit down and draw any networks/diagram you wish and its very straight fordward. Here is a quick example of what components and ports communicate and use it toward your drawings. I have several ESX 3.5 & ESX 4.0 architecture diagram for my clients but that would be strictly confidential and wouldn't post it here. For more information, download ESX 4.0 guides online.
http://vmwaretips.com/wp/2008/12/15/vmware-vi3-network-communication-diagram/
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Regards,
Stefan Nguyen
VMware vExpert 2009
iGeek Systems Inc.
VMware, Citrix, Microsoft Consultant