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