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