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