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