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