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