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