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