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