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