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