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