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