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