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