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