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