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)(26,29)(28,32)(33,37)(36,38)(3,8)(6,7)(9,10,14,13)(11,16,19,15)(12,17,20,21)(18,23,24,22)(25,26,31,29)(27,32,35,28)(30,33,39,37)(34,38,40,36)(1,3)(2,6)(4,7)(5,8)(9,11)(10,15)(12,18)(13,16)(14,19)(17,22)(20,24)(21,23)(25,27,31,35)(26,32,29,28)(30,34,39,40)(33,38,37,36)(1,3)(2,7)(4,6)(5,8)(9,11)(10,16)(12,18)(13,15)(14,19)(17,23)(20,24)(21,22)(25,28)(26,27)(29,35)(30,38)(31,32)(33,40)(34,37)(36,39) involution — undirected(9,12,14,20)(10,17,13,21)(11,18,19,24)(15,22,16,23)(25,29,31,26)(27,28,35,32)(30,37,39,33)(34,36,40,38)(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)(27,34)(28,36)(29,37)(31,39)(32,38)(35,40)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.