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