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