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