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