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