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