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