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