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