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