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