You can 'center' your data using the normalize function.
As for "represent the data in figure" do you mean you want to plot the centered data? If not can you say more about what type of visualization you want to create?
dicerolls = randi(6, 1, 100);
centeredDicerolls = normalize(dicerolls, 'center');
Although for rolling six-sided dice, you may want to subtract off the theoretical mean of 3.5 instead of the mean of your set of rolls.
dicerollsMinus3p5 = normalize(dicerolls, 'center', 3.5);