One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(10,11)(14,15)(25,26,31,28)(27,34,32,29)(30,36,38,33)(35,37,39,40)(10,11)(14,15)(18,21)(22,24)(25,27,31,32)(26,29,28,34)(30,35,38,39)(33,37,36,40)(9,10,13,11)(12,14,16,15)(17,18,20,21)(19,22,23,24)(25,28,31,26)(27,29,32,34)(30,36,38,33)(35,37,39,40)(1,2)(3,6)(4,5)(7,8)(9,11,13,10)(12,15,16,14)(25,29)(26,32)(27,28)(30,37)(31,34)(33,39)(35,36)(38,40)(1,3,4,7)(2,6,5,8)(9,12,13,16)(10,14,11,15)(17,19,20,23)(18,22,21,24)(25,30,31,38)(26,33,28,36)(27,35,32,39)(29,37,34,40)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.