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