creation of scalogram from multichannel eeg

i am working on eeg signals and making scalograms from signals i have 32 channels in my data and for one channel only one scaloogram is created .now i want to combine 32 scalograms in single scalogram how can i do this please can someone guide me??

Thanks in advance

the code i am using for making scalogram is given

Fs = 128;

fb = cwtfilterbank('SignalLength',7680,...
    'SamplingFrequency',Fs,...
     'VoicesPerOctave',48);
sig = data(1,1:7680);
[cfs,frq] = wt(fb,sig);
t = (0:7679)/Fs;figure;pcolor(t,frq,abs(cfs))
set(gca,'yscale','log');shading interp;axis tight;
title('Scalogram');xlabel('Time (s)');ylabel('Frequency (Hz)')

[Manish Sharma]

Hey can you please help me in creating a scalogram from eeg signal using 1 channel only?