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