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