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