One vertex per element, one color per generator, with an edge from x to x·s.
(6,9)(7,11)(13,14)(15,19)(16,18)(17,20)(21,22,26,28)(23,24,27,25)(2,4)(5,6)(7,10)(8,9)(11,12)(13,14,16,18)(15,17,20,19)(21,23)(22,24)(25,28)(26,27)(1,2)(3,4)(13,14)(15,17)(16,18)(19,20)(21,24,26,25)(22,23,28,27)(5,7,8,11)(6,10,9,12)(21,25,26,24)(22,27,28,23)(5,6)(7,10)(8,9)(11,12)(13,15)(14,17)(16,20)(18,19) 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.