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