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