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