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