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