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