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