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