As per my understanding, you have a vector of signals which are you are planning to plot in SDI at once.
If you are planning to do this through UI, you can select the RUN in Simulink Data Inspector and click CONTROL + A + SPACE, which will plot all the signals under that RUN.
Selecting a set of signals inside a RUN and pressing SPACE would basically check/uncheck the signals and subsequently plot/un-plot them from the plot area.
If you are planning to this through programmatically, you can iterate over list of signals in the RUN and use the plotOnSubPlot() APi to plot signals.
Below is the code-snippet which does that.
// creating vector with list of signals.
sine_vals = sin(2*pi/5*time);
sine_ts = timeseries(sine_vals,time);
sine_ts.Name = 'Sine, T=5';
cos_vals = cos(2*pi/8*time);
cos_ts = timeseries(cos_vals,time);
cos_ts.Name = 'Cosine, T=8';
vec = [sine_ts, cos_ts]
// Run creation with created vector
runID = Simulink.sdi.createRun("Sample_Run","vars", vec);
runObj = Simulink.sdi.getRun(runID);
// Launch SDI
//Iterate over signals and plot them in SDI
for index = 1:runObj.SignalCount
signalObj = runObj.getSignalByIndex(i);
// Plot signal on the first plot in the layout