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