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