There are likely many different ways to do this. My first instinct is to use findgroups and splitapply.
rawdata = readtable('Newfile.xlsx');
G = findgroups(rawdata.Cycle);
ax = axes;
hold(ax,'on')
myPlot = @(v) plot(ax,v,'-o');
splitapply(myPlot,rawdata.Pressure,G)
hold(ax,'off')
If you know each cycle will have the same number of points, then you could reshape the vector so each column contains a cycle, then just plot that matrix.
d = reshape(rawdata.Pressure,7,[]);
figure
plot(d,'-o')
