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