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