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