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