For OP's question, Helldivers 2 may fit the bill. You only get to play the Helldivers (no faction select), but their colors are yellow, black, and white. Helldivers 2 isn't an MMO like Planetside, you can only play with 3 other people. But it does have global objectives all players work towards, like capturing a planet.
They have some armors you can get that have gold specifically as well. You can mix and match your helmet, armor, and cape to hopefully get the colors you want.
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