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