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