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