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