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