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