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