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