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