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)(25,26,31,34)(27,35,38,29)(28,37,40,32)(30,36,39,33)(2,5)(6,8)(11,17)(12,19)(15,20)(16,21)(25,27,31,38)(26,29,34,35)(28,33,40,36)(30,37,39,32)(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)(26,29)(28,36)(30,37)(31,38)(32,39)(33,40)(34,35) involution — undirected(9,11)(10,15)(12,18)(13,17)(14,20)(16,22)(19,23)(21,24)(25,28,31,40)(26,32,34,37)(27,36,38,33)(29,39,35,30)(1,2)(3,6)(4,5)(7,8)(9,12,13,19)(10,16,14,21)(11,18,17,23)(15,22,20,24)(25,29)(26,27)(28,39)(30,40)(31,35)(32,36)(33,37)(34,38)(1,3)(2,6)(4,7)(5,8)(9,10)(11,15)(12,16)(13,14)(17,20)(18,22)(19,21)(23,24)(25,30,31,39)(26,33,34,36)(27,37,38,32)(28,29,40,35)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.