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