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