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