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