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