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