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