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