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