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