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