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