There's no difference. Verbs that consist of a noun and the verb する (します) can be separated by adding for example を between them without change in meaning. する means to do as you probably already know so any noun +する literally means "to do (noun)" 勉強(を)する to do studying (to study) 料理(を)する to do cooking (to cook) 旅行(を)する to do travelling (to travel)

前者は前に名詞を伴います 例)私は英語の勉強をします。　=I study English 後者は名詞を伴いません 例）私は勉強をします =I study