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