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