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