Currently the Azure AD application delegated permissions "Group.Read.All" and "Group.ReadWrite.All" requires admin consent.
Refer: http://graph.microsoft.io/en-us/docs/overview/release_notes
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Group permission scopes
The Microsoft Graph exposes two permission scopes (Group.Read.All and Group.ReadWrite.All) for access to groups APIs. These permission scopes must be consented to by an administrator (which is a change from preview). In the future we plan to add new scopes for groups that can be consented by users.
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In our application we have requirement for these scope permissions with user consent alone. Please let us know any workaround and ETA for this feature.