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We study exclusive dijet production in coherent diffractive processes in deepinelastic scattering and real (and virtual) photon-hadron ($\gamma^{(*)}$-h)collisions in the Color Glass Condensate formalism at leading order. We showthat the diffractive dijet cross section is sensitive to the color-dipoleorientation in the transverse plane, and is a good probe of possiblecorrelations between the $q\bar{q}$-dipole transverse separation vector $\r$and the dipole impact parameter $\b$. We also investigate the diffractive dijetazimuthal angle correlations and $t$-distributions in $\gamma^{(*)}$-hcollisions and show that they are sensitive to gluon saturation effects in thesmall-$x$ region. In particular, we show that the $t$-distribution ofdiffractive dijet photo-production off a proton target exhibits a dip-typestructure in the saturation region. This effect is similar to diffractivevector meson production. Besides, at variance with the inclusive case, theeffect of saturation leads to stronger azimuthal correlations between the jets.

Diffractive Dijet Production in Deep Inelastic Scattering and Photon-Hadron Collisions in the Color Glass Condensate