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