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