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