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