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