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