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