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)(27,28)(29,38)(30,33)(31,39)(32,36)(34,37)(35,40)(3,7)(5,8)(9,10,14,18)(11,16,21,15)(12,13,17,23)(19,24,22,20)(25,27,32,33)(26,30,36,28)(29,31,37,40)(34,39,38,35)(1,2)(3,5)(4,6)(7,8)(9,11,14,21)(10,15,18,16)(12,19,17,22)(13,20,23,24)(25,28,32,30)(26,33,36,27)(29,39,37,35)(31,38,40,34)(9,11)(10,16)(12,22)(13,20)(14,21)(15,18)(17,19)(23,24)(25,29,32,37)(26,34,36,38)(27,31,33,40)(28,35,30,39)(1,3,4,7)(2,5,6,8)(9,12)(10,13)(11,19)(14,17)(15,20)(16,24)(18,23)(21,22)(25,30,32,28)(26,33,36,27)(29,35,37,39)(31,38,40,34)(1,2)(3,5)(4,6)(7,8)(9,13)(10,17)(11,20)(12,18)(14,23)(15,22)(16,19)(21,24)(25,31)(26,35)(27,37)(28,38)(29,33)(30,34)(32,40)(36,39) 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.