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