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