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