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