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