You couldn't create much of a graph from users - they're not numeric.
The best you could do would be creating a filter for the issues you are interested in, and use it in a "2 dimensional statistics" gadget on a dashboard, choosing status on X axis and the user field you are interested in on Y (assignee? Reporter?)
If you are still searching for solution, please take a look at eazyBI report creation add-on for JIRA. With eazyBI you can create custom reports based on JIRA data.
Here is an example report that shows unresolved issues colored by their current Status and grouped by Assignee.
Let me know if you have any questions regarding eazyBI!
Lauma / email@example.com
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