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