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