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