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