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