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