Get the transfer function when using the "designfilt" command in MATLAB
The filter is a discrete FIR filter, so the transfer function would be given as:
$$H(z) = .0287 + 0.1430z^{-1} + 0.3283z^{-2} + 0.3283z^{-3}+0.1430z^{-4}+0.0287z^{-5}$$
With the frequency response given by using the unit circle for the complex variable $z$, as in $z = e^{j\omega}$ for $\omega \in [0, 2\pi)$, with the sampling rate normalized to $\omega = 2\pi$.
You can use the freqz command in Matlab to plot or return the frequency response:
freqz([0.0287 0.1430 0.3283 0.3283 0.1430 0.0287])

Which creates a plot similar to what I have done using Octave below for these coefficients:

The frequency axis will be normalized to the radian angular sampling frequency, but you can refer to Matlab's documentation for other parameters that can be passed in to freqz to scale the frequency otherwise.