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