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