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