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