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