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