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