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