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