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