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