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