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