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