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