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