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