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