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