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