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