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