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