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