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