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