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