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