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