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