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