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