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