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