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