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