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