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