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