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