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