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