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