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