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