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