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