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