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