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