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