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