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