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