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