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