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