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