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