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