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