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