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