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