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