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