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