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