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