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)(27,33,28,29)(30,34,39,40)(35,38,36,37)(1,2)(3,6)(4,7)(5,8)(9,10)(11,16)(12,17)(13,18)(14,15)(19,21)(20,24)(22,23)(26,32)(27,28)(34,40)(35,36) involution — undirected(1,3)(2,5)(4,8)(6,7)(25,27,31,28)(26,29,32,33)(30,35,39,36)(34,37,40,38)(9,11,14,17)(10,16,15,12)(13,19,22,24)(18,21,23,20)(25,28,31,27)(26,33,32,29)(30,36,39,35)(34,38,40,37)(1,3)(2,6)(4,8)(5,7)(9,12,14,16)(10,17,15,11)(13,21,22,20)(18,19,23,24)(25,29,31,33)(26,27,32,28)(30,38,39,37)(34,36,40,35)(1,2)(3,5)(4,7)(6,8)(9,13)(10,18)(11,19)(12,20)(14,22)(15,23)(16,21)(17,24)(25,30)(26,34)(27,35)(28,36)(29,37)(31,39)(32,40)(33,38) involution — undirectedA 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.