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)(12,19,21,16)(18,20,24,22)(25,26)(27,33)(28,32)(29,34)(30,35)(31,38)(36,37)(39,40)(1,2,6,5)(3,8,4,7)(10,15)(11,17)(16,19)(18,24)(25,27)(26,31)(28,36)(29,37)(30,38)(32,39)(33,35)(34,40)(1,3,6,4)(2,7,5,8)(10,15)(11,17)(16,19)(18,24)(25,28,30,34)(26,32,35,29)(27,36,38,40)(31,39,33,37)(1,4,6,3)(2,8,5,7)(9,11)(10,13)(12,18)(14,17)(15,23)(16,22)(19,20)(21,24)(25,28)(26,32)(27,36)(29,35)(30,34)(31,39)(33,37)(38,40)(1,5,6,2)(3,8,4,7)(9,12,14,21)(10,16,15,19)(11,18,17,24)(13,22,23,20)(25,27)(26,33)(28,36)(29,39)(30,38)(31,35)(32,37)(34,40)(9,13)(10,17)(11,15)(12,20)(14,23)(16,18)(19,24)(21,22)(25,29,30,32)(26,34,35,28)(27,37,38,39)(31,40,33,36)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.