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