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