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