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