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