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