Hi Onur,
are you using advanced roadmap or standard roadmap? This may vary according your jira plan. If you have standart plan, you can not separate by color.
But you can use quick filters. You can create a label containing client and add this label to related epic. In this way, you can create a quick filter for the epics that have the label you created and use this filter on the roadmap.
If I understand your problem correctly, you can come up with such a solution.
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