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