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