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