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