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