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