using your code , i have created a fiddle. i used data from another fiddle as your data was not here. one more change i made is that , in legends i kept enabled:true only and removed all styles. your legends were coming on the pie that could be the reason your legend's color might not be distinguished .

 legend: {
            enabled: true /*,
            layout: 'vertical',
            float: true,
            style: {
                left: '0px',
                bottom: 'auto',
                right: 'auto',
                top: '0px',
                margin: '0px',
                padding: '5px'

see my the working fiddle here

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