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