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