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)(25,26,31,36)(27,34,39,32)(28,30,35,40)(29,38,37,33)(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)(26,32)(28,37)(29,35)(30,38)(31,39)(33,40)(34,36)(1,3)(2,4)(5,8)(6,7)(10,12)(15,17)(16,20)(22,23)(25,28,31,35)(26,30,36,40)(27,37,39,29)(32,38,34,33)(2,6)(4,7)(9,12,14,10)(11,17,19,15)(13,20,21,16)(18,23,24,22)(25,29)(26,33)(27,28)(30,32)(31,37)(34,40)(35,39)(36,38)(1,4)(2,3)(5,7)(6,8)(9,11)(10,15)(12,17)(13,18)(14,19)(16,22)(20,23)(21,24)(25,27)(26,34)(28,37)(29,35)(30,33)(31,39)(32,36)(38,40) involution — undirected(1,3)(2,7)(4,6)(5,8)(9,13)(10,16)(11,18)(12,20)(14,21)(15,22)(17,23)(19,24)(25,30)(26,35)(27,38)(28,36)(29,32)(31,40)(33,39)(34,37) involution — undirectedA 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.