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