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