One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,3)(4,6,8,7)(9,10,13,16)(11,12,15,14)(25,26)(27,28)(29,37)(30,31)(32,34)(33,40)(35,39)(36,38)(2,3)(6,7)(9,11,13,15)(10,14,16,12)(18,21)(22,24)(26,31)(27,34)(33,37)(35,38)(4,8)(6,7)(9,10,13,16)(11,14,15,12)(17,18,20,21)(19,22,23,24)(25,27)(26,32)(28,31)(29,38)(30,34)(33,36)(35,40)(37,39)(1,3,5,2)(4,6,8,7)(9,11)(10,14)(12,16)(13,15)(17,19,20,23)(18,22,21,24)(25,28,30,32)(26,27,31,34)(29,39,40,36)(33,38,37,35)(1,4,5,8)(2,6,3,7)(9,12,13,14)(10,15,16,11)(25,29)(26,33)(27,35)(28,36)(30,40)(31,37)(32,39)(34,38)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.