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