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