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