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