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)(25,26,30,34)(27,28,32,31)(29,33,38,40)(35,36,37,39)(1,2)(3,7)(4,5)(6,8)(10,15)(11,16)(13,22)(20,24)(25,27,30,32)(26,31,34,28)(29,37,38,35)(33,36,40,39)(2,5)(6,7)(10,15)(12,18)(17,21)(20,24)(25,26,30,34)(27,31,32,28)(29,33,38,40)(35,39,37,36)(2,5)(6,7)(9,11,14,16)(10,12,15,18)(13,19,22,23)(17,20,21,24)(25,27)(26,31)(28,34)(29,35)(30,32)(33,39)(36,40)(37,38)(1,2)(3,6)(4,5)(7,8)(9,12)(10,16)(11,15)(13,20)(14,18)(17,23)(19,21)(22,24)(25,28,30,31)(26,32,34,27)(29,36,38,39)(33,37,40,35)(1,3)(2,6)(4,8)(5,7)(9,13)(10,17)(11,19)(12,20)(14,22)(15,21)(16,23)(18,24)(25,29,30,38)(26,33,34,40)(27,35,32,37)(28,36,31,39)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.