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