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