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