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