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