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