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