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