Operator Overloading of class object not working while accessing vector element which contains it?

I have done the following operator overloading which works as expected on the following class object. But when I pass this pointer to class object in the vector, the output stream doesn't work (in the manner I defined it)

I'm sorry for this type of question but I am new in C++ and I don't know how to ask this exactly.

Operator Overloading:(shape.cpp)

ostream &operator<<(ostream &output, Shape &S)
{
    output << S.name << " (" << S.id << ") " << endl;
    return output;
}

Inside Shape Class(shape.h): friend ostream& operator<<(ostream& output, Shape &S);

main.cpp:

#include <iostream>
#include <vector>
using std::cout;
int main()
{
    vector<Shape*> array;
    Shape * s1 = new Shape("Square");

    array.push_back(s1);
    cout << *s1; //Prints "Square (1)" 
    cout << array[0]; //Prints "007CADC8" maybe hex address of vector element?

    return 0;
}