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