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