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