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