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