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