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