[Golden96]

You'll need to have a variable to hold the colors and then run a loop via your command to set them all.

I.E;

PHP код:

CMD:toorange(playerid, params[]) {
    for(new i = 0; i< MAX_PLAYERS; i++) {
        if(IsPlayerConnected(i)) {
            SetPVarInt(i, "color", GetPlayerColor(i));
            SetPlayerColor(i, 0xD1773BFF); // orange
        }
    }
    return 1;
}
CMD:returncolors(playerid, params[]) {
    for(new i = 0; i < MAX_PLAYERS; i++) {
        if(IsPlayerConnected(i)) {
            SetPlayerColor(i, GetPVarInt(i, "color"));
        }
    }
    return 1;
} 


This will be different depending on what you use to create commands obviously.
The reason I use SetPVarInt is so that if the player disconnects and another joins, it won't give the new player the old player's color. It's a lot easier.