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