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