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