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