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