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