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