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