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