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