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