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