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