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